Concrete pouring form accessory

ABSTRACT

A concrete pouring form accessory includes a post which supports a slidably removable sleeve and insert threaded thereto in a mold or pouring form during pouring of a concrete railroad tie. Following hardening of the railroad tie, the tie is readily slidably removed from the support post thereby leaving the sleeve disposed within the insert to protect threads of the insert until the sleeve has been unscrewed from the insert (usually at the time of bolting rails to the railroad tie). A resilient annular cone-shaped sealing element forms a plug behind the insert and sleeve to preclude the application of blocking concrete behind the sleeve and the support post.

Umted States Patent [151 3, Kowell [451 Aug. 22, 1972 [54] CONCRETE POURING FORM 2,366,401 '1/1945 Haskell ..249/91 X ACCESSORY 3,418,781 12/ 1 968 Penotem'. ..52/699 3,577,610 5/1971 Hargolin ..25/2 [72] Invent 221'? Greenbrae' 3,305,907 2/1967' Baker ..25/2

[73] Assignee: J. A. Pomeroy & Company, Inc., Primary Examiner-J. Spencer Overholser San Francisco, Calif. Assistant Examiner-Ben D. Tobor Oc 21, Attorney-F lehr, HOhbaCh, Test, & Herbert Appl. No.: 82,638

Related US. Application Data [57] ABSTRACT A concrete pouring form accessory includes a post which supports a slidably removable sleeve and insert [62] E a 1?: g gj' sif 716516 March I968 threaded thereto in a mold or pouring'fonn during I pouring of a concrete railroad tie. Following harden- 1 ing of the railroad tie, the tie is readily slidably removed from the support post thereby leaving the [58-] Fieid l37lg 373 249/83 7 sleeve disposed within the insert to protect threads of 249/91 1 264/35 the insert until the sleeve has been unscrewed from 271 278, l8/DIG 25/131 the insert (usually at the time of bolting, rails to the v railroad tie). A resilient annular cone-shaped sealing 7 element forms a plug behind the insert and sleeve to [56] References cued preclude the application of blocking con'crete behind UNITED STATES PATENTS the Sleeve and the pp P 3,47l,1 18 10/1969 Borrnann ..249/86 X 3 'Claims, 9 Drawing Figures -g l' J #Q 6] 33d .74 /7a 5m W/Z 3/0 28 27 32 j/l 31 v i g a; a 37 55 PATENTEDmczz m2 SHEET 1 [IF 2 INVENTOR. Ed war d L. Kowell BY PATENTED 1822 1972 SHEET 2 UF 2 Fig.5

INVENTOR. d w ard L. Kowell Attorneys 1 CONCRETE POURING FORM ACCESSORY CROSS-REFERENCE TO RELATED APPLICATIONS This application is a division of US. application Ser. No. 716,516, now US. Pat. No. 3,557,274, filed Mar. 27, 1968 and entitled METHOD FOR MOLDING A CONCRETE RAILROAD TIE BACKGROUND OF THE INVENTION I This invention pertains to a concrete pouring form accessory for forming a concrete product and to the product itself The invention has particular utility in forming concrete railroad ties of a type, for example, as employ prestressing elongated tendons carried under tension therein.

SUMMARY OF INVENTION AND OBJECTS tive engagement portions, such as exterior threads formed around the outside of the sleeve, is slidably positioned onto the distal end of the support post. An anchor element of a type adapted to receive and hold bolts to be coupled or threaded thereto when embedded in concrete is carried by the sleeve mounted on the post. Thus, the anchor element is carried in readily releasable positive engagement with the sleeve whereby unscrewing the sleeve from the anchor element serves to expose the threads for use with bolts of a type adapted to attach railroad rails to the ties.

Each anchor element is, in general, provided with laterally protruding portions which serve to develop a positive holding anchored engagement with concrete upon hardening of the concrete in which it is submerged. Thus, a flange is formed about the anchor element. Further, means are carried by the support post which serve to preserve sufficient clearanceaxially behind the sleeve and behind the post which is effective during placement of concrete poured about the accessory to preserve the ready removal path of the post' proved pouring form accessory for providing an anchor insert of a type having internal threads and wherein the threads are arranged in protected, sealed condition until ready for application of rails to the tie.

These and other objects of the invention will be more readily apparent from the following detailed description, when taken in conjunction with the drawing.

" BRIEF DESCRIPTION OF THE DRAWING FIGS. 1 and 2 are respectively plan and side elevation views of a railroad tie formed according to the invention;

FIG. 3 and 4 are respectively enlarged elevation section views taken along the line 3-3 and 4-4 respectivey; I

FIG. 5 is a schematic end view, in section, showing a pouring form accessory according to the invention;

FIG. 6 is an enlarged, exploded, isometric view of a pouring form accessory according to the invention;

FIGS. 7 and 8 are each transverse end section views showing a concrete-product according to the invention respectively in a state immediately following removal from the pouring form shown in FIG. 5 and shown in position ready to receive the application of rails thereto; and

FIG. 9 is an enlargedelevation section view of a central portion of the casting accessory assembly 28'.

DESCRIPTION OF THE PREFERRED EMBODIMENT With'reference to FIGS. 1 and 2, a concrete railroad tie 10 of a type employing prestressing tensioned tendons 11-, 12, 13, 14 includes molded or cast portions for supporting railroad rails and ballast'portions adapted for contact signal supports; the mutually inwardly and downwardly sloping rail pad portions 16 are adapted to receive the lower flanges of railroad rails each of inserts 17, 18 as embedded in the concrete of the body of railroad tie 10 form anchoring of attachment with tie l0 for'coupling forces acting along the axis of inserts 17, 18 to the body of concrete.

In order to enhance and derive improved holding action and thereby increase the restraint with which the concrete of tie 10 holds inserts 17, which are subjected to the great forces applied by trains travellingon rails supported upon pad portions 16, it has been found advantageous to dispose tendons 12, 13 relatively closely adjacent the sides of inserts 17. Thus, tendons 12, 13 have been disposed relative to inserts 17in a manner whereby a pair of parallel planes 21, 22, disposed paralleled to the axis of inserts 17 and respectively spaced laterally in a common direction from the axis of inserts 17 may be defined on each side of the inserts 17. The parallel planes thus respectively lie contiguous to the bounding adjacent portions of tendons 12 or 13 respectively and inserts 17 The spacing 23 between the parallel planes 21, 22 is sufficiently narrow sov as to cause the tendon 12 to contribute restraint to the axial movement of inserts 17 in the body of concrete under application of forces to the inserts, as by means of the applied forces experienced by trains carried on the rails thus supported.

' 1 'Post31 includes an v In the method of forming the precast concrete railroad tie bodies, 'afrarne, such as the box-like structure The inner end of each insert 17 is formed with a radially outwardlyprojecting flange portion 17a forming 24, open along the top,- serves to hold a wooden pouring form '26 or mold of a type suitable for receiving the mixed concrete. Tendons 11, 12, 13 and 14 are supported by conventional means in each of the opposite end walls 27 of the pouring form structure.

] A concrete pouring form accessory in the form of the casting assembly 28 serves to provide the concrete tie with an embedded insert formed with female threads 29 for positively engaging the threaded end of a bolt, of a type as conventionally utilized in applying rails to pads 16. The threads29 of each insert 17 are further providedin a mannerwhereby they remain sealed from exposure to damaging influences whereby 'at the pointof utilization the threads are not clogged or r rusted, or otherwise damaged.

'.Thus', amounting post3l 'is fixedly carried to project inwardly from-the wall 32 of'pouringform An exteriorly threaded anti-friction sleeve 33,.threadedly engages the interior threads 29 of, the annular insert 17.

.Sl'eeve :33 irtClu'desQa interior bore for slidably positioningsleeve 33 onto-the upper end portion 31d of 31; Preferably, sleeve 33 consists of an anti-friction material suchjas various known plastics in order to facilitate its ready removal from post'31.

1 While only a single 31' has been described above, it will be evident that a number of such mounting posts 31 shall be utilized in cooperationwith the other inserts 17,18 and the provision of the anti-friction sliding relation between the interior of sleeves 33 order to-flprovide readyremoval the'reof from the hardened concrete product.

Element 37 serves to define access passages 36 be- I hind sleeve 33 and; together with post portion 31b serves to' define the access passage behind post portion 310 whereby the-post portion 31a may b'e readilywithdrawn from the concrete body upon hardening of r the concrete.

laterally protruding portions serving to develop a positive holding anchored engagement with the hardened concrete in which it is submerged. Having completed the foregoing steps, it is then only necessary-to pursue 1 the final steps of pouring hardenable concrete-forming material into mold form 26 while sealing the mold form at the outer end of the sleeve 33 and post '31 in a manner preserving the access clearance behind both of these elements for later backing them out. of the body of concrete after it has hardened.

' Subsequently, after permitting the poured material to harden, each tie body is pulled relativelyaway from the posts 31 to slidably remove the posts 31 from their respective sleeves 33. Sleeves 33are left'in place 'until the tie 10 is ready for use. At that time sleeves 33 are unscrewed from theirrespective inserts 17 in order to expose the interior threads 291for attachment to suitable threaded bolts as employed forattachment to rails to be laid upon ties 1o.

From the foregoing, it will .be readily evident" that i there has been provided an improved concrete product same frominsert 17.

37 and post portion 31b serve to preserve sufiicient clearance axially behind sleeve 33 and post portion 31a during placement of concrete so as to permit ready removal, first of the post from the sleeve, and later of the sleeve from the insert 17 when rails are ready to be secured to the tie 10.

, After post 31 has been loosely secured to the wall 32 of form 26, as by means of thenut 38am! washer 39,

' f the base of assembly 28.

formed with an attachment device of a having I I female threads adapted to cooperate with the threaded for use. The interior ofthe plug serves further the purpose of readily releasing the precast body of concrete from its pouring form. Thus, when the product is ready for use, it is a simple matter tomerely drive a screwdriver into the plastic sleeve, 33 vand unscrew I claim:

l. A concrete pouring form accessory for providing an anchor insert element embedded in a concrete.

product comprising a support post adapted to be fixed to a pouring form to project inwardly of awall portion 3 bolts to be coupled thereto. when embedded in a.

concrete product, said anchor element being positioned onto said sleeve and having positive engagement portions inreadily releasable positive engagement with the first named said portions and formed with laterally protruding exteriorportions serving to develop a positive holding anchored engagement with concrete upon hardening of concrete submerging same, means preserving sufi'icient clearance axially and behind and detached from said sleeve and said post during placement of concrete submerging the post and sleeve to permit, after hardening o the concrete, the ready removal of the post .from said sleeve and the latter removal of the sleeve from the insert.

2. A concrete pouring form accesory for providing orly thereof and slidably positioned onto the distal end V of said post, an anchor element'of a typeadapted to receive and hold bolts to be threaded thereto when embedded in a concrete product, said anchor element being positioned onto said sleeve in readily releasable positive engagement therewith and formed with laterally protruding portions serving to develop a positive holding anchored engagement with concrete upon hardening of concrete submerging same, means preserving sufficient clearance axially behind and detached from said sleeve and said post during placement of concrete submerging the post and sleeve to permit, after hardening of the concrete, the ready 

1. A concrete pouring form accessory for providing an anchor insert element embedded in a concrete product comprising a support post adapted to be fixed to a pouring form to project inwardly of a wall portion of the form, a protective sleeve formed with radially outwardly extending positive engagement portions exteriorly thereof and a longitudinally smooth interior slidably positioned onto the distal end of said post, an anchor element of a type adapted to receive and hold bolts to be coupled thereto when embedded in a concrete product, said anchor element being positioned onto said sleeve and having positive engagement portions in readily releasable positive engagement with the first named said portions and formed with laterally protruding exterior portions serving to develop a positive holding anchored engagement with concrete upon hardening of concrete submerging same, means preserving sufficient clearance axially behind and detached from said sleeve and said post during placement of concrete submerging the post and sleeve to permit, after hardening of the concrete, the ready removal of the post from said sleeve and the latter removal of the sleeve from the insert.
 2. A concrete pouring form accessory for providing an anchor insert embedded in a concrete product comprising a support post adapted to be carried by a pouring form to project inwardly of a wall portion of the form, a protective sleeve formed with threads exteriorly thereof and slidably positioned onto the distal end of said post, an anchor element of a type adapted to receive and hold bolts to be threaded thereto when embedded in a concrete product, said anchor element being positioned onto said sleeve in readily releasable positive engagement therewith and formed with laterally protruding portions serving to develop a positive holding anchored engagement with concrete upon hardening of concrete submerging same, means preserving sufficient clearance axially behind and detached from said sleeve and said post during placement of concrete submerging the post and sleeve to permit, after hardening of the concrete, the ready removal of the post from said sleeve and the latter removal of the sleeve from the insert.
 3. A pouring form accessory according to claim 2 wherein the last named means comprises an annular resilient truncated cone element surrounding the post and adapted to be coated with an application of anti-bonding material to provide ready removal thereof from the hardened concrete product. 